Capitalism exists in every country today. You would not have chinese billionaires today if they were not a capitalistic country. They are socialist in almost name only these days; they are clearly not interested in redistributing wealth or favoring the health of the collective over the wealth of the elite. IMO there aren't many great examples of socialist governments, since many of the historical examples we've seen have been from a powerful elite using the mass appeal of the socialist message solely to put themselves in charge of an authoritarian state and use that position to further their own personal interests, versus to focus on collective benefits.